Views:2 Author:Site Editor Publish Time: 2020-03-10 Origin:Site
The common name and generalization of cork
Cork commonly known as water pine, wood bolt, bolt, is a very developed tree species of epithelial products, stems and roots after coarse growth of the surface protection tissue. Ancient Egypt, Greece and Rome were used to make fishnet floats, insoles, corks, etc.
There are already records of cork in the Spring and Autumn Period of China. The main tree species for the production of cork are wood thorad and cork. Usually 20 years or more, chest diameter greater than 20 cm plant can be the first peeling, the resulting skin is called head or raw skin. After every 10 to 20 years to harvest, the resulting skin called recycled skin, skin thickness of more than 2 cm.
Cork's cork (foreign known as the cork skin), difficult to adapt to the high temperature climate, generally grown in the subtropical, temperate climate area of 400-2000 meters above sea level in the mountains. In the 32-35 degree latitude, in line with the geographical and climatic conditions of the mountainous areas, most can be seen cork resources. For example, Portugal, Spain, the southern part of France, as well as China's Qinba Mountains, southwestern Henan and so on.
Portugal is known as the "Softwood Kingdom", because of its special Mediterranean-style climate, suitable for the growth of cork raw materials, at the same time, Portugal is the world's development of cork resources, raw materials export, as well as product deep processing one of the earliest countries.
The Qinba Mountain area in Shaanxi Province of China also contains abundant cork resources, accounting for more than 50 percent of the country's cork resources. Therefore, Shaanxi is known in the industry as the "softwood capital", relying on this resource advantage, the domestic current large-scale cork manufacturers mainly concentrated here.
Cork consists of flat cells arranged by many radiations. Cell cavity often contains resin and tannin compounds, the cell is full of air, so the cork often has color, soft texture, elastic, impermeable, not susceptible to the role of chemicals, but also electricity, heat and sound of the bad conductor. It consists of dead cells with 14 polygons arranged between them in the radiation of a hexagonal prism. Typical cells have a diameter of 30 microns and a cell thickness of 1 to 2 microns. There are catheters between cells. The interval between the two adjacent cells consists of five layers, two of which are fiber properties, followed by two layers of wood thromboization, with a layer of wood layer in the middle, with more than 50 million cells per 1 cubic centimeter.